21206200 has 24 divisors (see below), whose sum is σ = 49304880. Its totient is φ = 8482400.

The previous prime is 21206189. The next prime is 21206219. The reversal of 21206200 is 260212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52816 + ... + 53215.

It is an arithmetic number, because the mean of its divisors is an integer number (2054370).

Almost surely, 2^21206200 is an apocalyptic number.

21206200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21206200 is an abundant number, since it is smaller than the sum of its proper divisors (28098680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21206200 is a wasteful number, since it uses less digits than its factorization.

21206200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106047 (or 106038 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21206200 is about 4605.0190010466. The cubic root of 21206200 is about 276.7924783838.

Adding to 21206200 its reverse (260212), we get a palindrome (21466412).

The spelling of 21206200 in words is "twenty-one million, two hundred six thousand, two hundred".